NMS Labs Forensic Analysis: What High Mitragynine Actually Means — and What It Doesn't

Why it matters

NMS Labs forensic toxicologist Justin Brower has described patterns across hundreds of kratom-associated death case discussions that complicate simple single-substance attributions — including atypical autopsy presentation, empty gastric contents, and postmortem redistribution that inflates blood concentrations.

The big picture

NMS Labs is one of the largest forensic toxicology laboratories in the United States. Toxicologist Justin Brower has discussed kratom-associated death cases with pathologists across many jurisdictions. His publicly presented observations cut both ways — not defending kratom as harmless, but challenging the simplistic 'high mitragynine = massive leaf overdose = ban the leaf' inference.

Key findings

• On gastric contents: 'They're not finding huge amounts of kratom material or capsules in gastric contents — it's usually pretty empty inside.' No green sludge, ghost pills, or botanical loads — challenging death narratives that depend on massive natural-leaf ingestion.
• On autopsy presentation: kratom-associated cases often do not show classic opioid overdose signs (foam, heavy lungs, pulmonary edema, urinary retention) — they appear more like sudden collapse events.
• On postmortem redistribution: mitragynine has a long half-life and large volume of distribution; it accumulates with chronic use and may redistribute after death, inflating blood concentrations.
• Concentration thresholds (Brower's framework): above 500 ng/mL — possible contributor with other drugs; above 1,000 ng/mL — consider as possible cause, but total case context required.
• On product form: 7-hydroxymitragynine and pseudoindoxyl are 'not kratom in the ordinary leaf sense' — chemical modifications. Kratom should not be lumped into bans aimed at those compounds.
• On testing gaps: basic immunoassay panels do not detect mitragynine or related alkaloids. NMS added 7-OH and pseudoindoxyl to its time-of-flight screen specifically to capture them.

What they say

"They're not finding huge amounts of kratom material in gastric contents — it's usually pretty empty inside." — Justin Brower, NMS Labs

Bottom line

The NMS evidence does not say ignore kratom. It says stop pretending every kratom label means natural leaf, and stop reading high blood levels as proof of massive leaf ingestion without checking the stomach and the full autopsy.